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Modeling the Output Impedance of Three-Phase Uninterruptible Power Supply in D-Q Frame

Fig. 1. Measurement results compared with model for open loop
The three-phase Uninterruptible Power Supply (UPS) is widely used to protect critical loads. The output impedance is a very important design specification of a UPS inverter, since the output impedance of a UPS inverter determines the voltage distortion caused by the nonlinear loads and also the stability of the whole system. This paper models the output impedance of a three-phase UPS inverter with current and voltage feedback control in d-q frame. An analytical model of UPS output impedance is derived, and experimental results are shown to verify the analysis.


Fig. 2. Measurement results compared with model for current loop control
Fig. 3. Measurement results compared with model for voltage control
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